4.6.1.1	adenylate cyclase	-	
4.6.1.2	guanylate cyclase	-	
4.6.1.6	cytidylate cyclase	-	
4.6.1.12	2-C-methyl-D-erythritol 2,4-cyclodiphosphate synthase	-	
4.6.1.13	phosphatidylinositol diacylglycerol-lyase	-	
4.6.1.14	glycosylphosphatidylinositol diacylglycerol-lyase	-	
4.6.1.15	FAD-AMP lyase (cyclizing)	-	
4.6.1.16	tRNA-intron lyase	-	
4.6.1.17	cyclic pyranopterin monophosphate synthase	-	
4.6.1.18	pancreatic ribonuclease	-